That's because LG is shutting down the update servers for its old smartphones on June 30, per Android Authority. This won't just affect updates you download directly to the phone;

The LG Bridge PC software is also shutting down at the end of June, which is used to transfer files and contacts from LG phones, alongside support for updates, backups, and device restoration.

LG gave up on making smartphones back in 2021, and now shares plans to turn off its update servers at the end of June.